exam Maths Puzzle Numerical Ability

Determine whether this is rational or irrational:

SQRT 25
This would be rational correct? Thank you for all your help!

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exam Other Question

i need to factorize x^2 + 1 /x^2 +2 -2x - 2/x , i need urgent help in this please i did this sum but the answers coming wrong . thanks Find values for m and b in the following system so that the solution to the system is (-3, 4).
5x+7y=b
mx+y=22